I think you ahve to hold the left trigger and use the d- pad to change lines. I know for PS2 you have to hold down L1 and use D- pad.

I like the new goalie animations in 2k6. Other than that, it si very similar to 2k5, but there are tons of sliders to adjust the game to how you like it, so I really enjoy 2k6, although I enjoy 06 as well